Using the point C and the point H_b, construct a line b (rule W02);

% DET: points C and H_b are not the same

Using the point H_b and the line b, construct a line h_b (rule W10b);

Using the point I and the line b, construct a circle k(I,P_a) (rule W11);

% NDG: point I is not incident to the line b

Using the circle k(I,P_a), the point C, the point I and the line b, construct a line a (rule W13);

% NDG: point C is outside the circle k(I,P_a)

Using the line a and the line h_b, construct a point B (rule W03);

% NDG: lines a and h_b are not parallel

% DET: lines a and h_b are not the same

Using the circle k(I,P_a), the point B, the point I and the line a, construct a line c (rule W13);

% NDG: point B is outside the circle k(I,P_a)

Using the line c and the line b, construct a point A (rule W03);

% NDG: lines c and b are not parallel

% DET: lines c and b are not the same